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looks like 2 good 7 59 1 tubes, with the left one more hours than the right one. The getter shine diminishes some as a tube gets more hours on it. I've had...
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Might try replacing the channel switching pedal, they have incredibly flimsy little pad type switches in them. Sorry just saw the dates on this old post.
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Hey , I had a Bug 55 HD clean / dirt switching pedal that did the same sort of switch witchery, had two new pedals sent from the sellers before I got a good...
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Find a BitMo kit on the bay, easy to put in if you have any soldering chops, gives you three dissimilar voicings,
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A friend found a deeel on a non working amp at a thrift. So.... Now I need a number on a transistor for a Trace TA60 CR Acoustic Amp. The amp must be an...
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Anyone use dielectric grease on tube sockets?
Had one preamp socket that would cut out intermittantly on a Bugera 55 head, would have to reach in and do a little happy spot searching. It finally would...
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You are performing what is called staking...if you don't do a conformal coating, expensive, you stake the circuit board components before putting them thru...
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Sounds like a dirty socket. Rock the tubes in their sockets once it heats up to see if it misbehaves as cold. Probably preamp?
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Good question you conjure... I would think cost is/was the big part, they were cheaper to produce. If it was a big positive difference today you would see...
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S/C AU33 mods sheet
Dave hope this is not too cluttered to use when it arrives....
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Feel you pain....bumping resting horses. The 7591/A were only used in large numbers by mid-high end audio hi-fi makers like Scott, Fisher and Mcintosh I think....
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Marshall VS65 speaker Upgrade
I have this infuriating need to try to improve things guitar... case in point, I tryed to remove the speaker from a Mash all VS65 combo. The idjits glued...
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Similiar but different...
The resistors on your diagram with the cap across is a pass filter of sorts( treble bleeder ? ), the resistor I...
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Black Rose circuit
The Nashville circuit sounds familiar, but I don't know it specifically, I do know the Black Rose circuit does exactly what...
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Never put both hands into a hot chassis....
An oldtimer, my dad, always said to keep one hand in my pocket when working live ... probably good...
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Thanks SG, the screen grid tweak worked great..
Just a fllow up, ... raised the screen R about 25 % to cut the gain on one, lowered the Vp...
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sorry for double clik. OP
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Yes.. and this too "Modifying Preamp Circuitry", unknown author ( Modifying Guitar Amp Preamp Circuitry ) I think this still works. Good stuff...
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